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Advisory severityHigh8.8Red Hat Linux

High [CVE-2026-16526] Privilege escalation to root via linux_sockets PMDA vulnerability

This high-severity Red Hat Linux advisory covers CVE-2026-16526 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-16526 Source published Source updated

VulniPulse record published Record updated

CVE-2026-16526
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

A flaw in the PCP linux_sockets module exposes an unsecured internal connection. An attacker with initial code execution can exploit this to escalate privileges and execute arbitrary commands as root.

This is an Important privilege escalation vulnerability in PCP where an attacker can escalate privileges from the `pcp` user to `root`. This flaw requires a prior `linux_sockets` command injection vulnerability and a non-default configuration where the `linux_sockets` PMDA is loaded as a DSO in PMCD.

Exploitation can occur locally or remotely depending on the `pmcd` and `pmproxy` configurations. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-403.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 9 more.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions
  • pcp-0:7.0.3-5.el10_2
  • pcp-0:6.3.7-1.el10_0.1
  • pcp-0:5.3.7-22.el8_10.5
  • pcp-0:5.2.5-8.el8_4.1
  • pcp-0:5.3.5-10.el8_6.1
  • pcp-0:5.3.7-19.el8_8.1
  • pcp-0:6.3.7-8.el9_8.4
  • pcp-0:6.0.1-8.el9_2.2
  • pcp-0:6.2.0-5.el9_4.2
  • pcp-0:6.3.7-1.el9_6.1
  • RHSA-2026:55617
  • RHSA-2026:72273
  • RHSA-2026:55560
  • RHSA-2026:74613
  • RHSA-2026:74612
  • RHSA-2026:73767
  • RHSA-2026:55740
  • RHSA-2026:72594
  • RHSA-2026:72593
  • RHSA-2026:72272

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this vulnerability, ensure that the `linux_sockets` PMDA is not configured to load as a Dynamic Shared Object (DSO) within PMCD. The default configuration for this PMDA is daemon mode, which is not affected by this flaw. Review your `pmcd.conf` file to confirm the `linux_sockets` PMDA is not loaded as a DSO. If changes are made to `pmcd.conf`, a restart of the `pmcd` service is required for them to take effect.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

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